How do you build the decks for a Monster Box game, with previous boxes and years included?

Question

Accepted Answer

Each box's Dark Arts and Hogwarts cards are added to the cards from all earlier years and boxes, so those decks grow cumulatively. The expansion starts from the decks built through Year 7. Villains and Creatures use the box's required ones plus random picks from the whole pool.

Harry Potter: Hogwarts Battle

How do you build the decks for a Monster Box game, with previous boxes and years included?